| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 6.9 | 18 |
| 2015 | 2.87 | 81 |
| 2014 | 4.22 | 71 |
| 2013 | 5.4 | 55 |
| 2012 | 2.73 | 81 |
| 2011 | -13.23 | 177 |
| 2010 | -25.29 | 175 |
| 2009 | -6.82 | 122 |
| 2008 | 0.35 | 119 |
| 2007 | 8.1 | 52 |
| 2006 | 35.45 | 3 |
| 2005 | 19.56 | 5 |
| 2004 | 1.82 | 135 |
| 2003 | 8.65 | 46 |
| 2002 | 6.02 | 52 |
| 2001 | -18.27 | 166 |
| 2000 | 6.52 | 57 |
| 1999 | 7.95 | 34 |
| 1998 | 7.62 | 35 |
| 1997 | 7.25 | 42 |
| 1996 | 11.08 | 17 |
| 1995 | 2.16 | 86 |
| 1994 | 4.5 | 63 |
| 1993 | -6.11 | 106 |
| 1992 | -2.2 | 98 |
| 1991 | 4.42 | 41 |
| 1990 | -5.05 | 102 |
| 1989 | 11.65 | 13 |
| 1988 | 9.76 | 22 |
| 1987 | 22.99 | 5 |
| 1986 | 22.99 | 7 |